If you answer no, then you simply acquire 10k prayer xp and 5k mining xp. Bring these goodies back to the priest and he'll bless them in RS gold the name of the god of your choice.
He will return them and you will get (by way of example, Saradomin) Saradomin priest gown top and bottom, Saradomin priest cape, along with saradomin priest staff. He will also give you a prayer publication of your god. (The priest robes and team along with cape will change appearance to coincide.)
Prayers from prayerbooks choose the location of a spellbook or even the default option spells. These prayers aren't actually prayers, and do not take away prayer points, but don't give prayer or magic xp when cast. These"prayers" are like cheap RuneScape gold the lumbridge home port, in that they have recharge times. Each god has a different prayer book.